package Thread2;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class Homework9 {
    // 基于Callable 实现 1 + 2 + 3 + ... + 1000
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        Callable<Integer> call = new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int sum = 0;
                for (int i = 1; i <= 1000 ; i++) {
                    sum += i;
                }
                return sum;
            }
        };

        FutureTask<Integer> futureTask = new FutureTask<>(call);

        Thread t = new Thread(futureTask);
        t.start();
        System.out.println("sum = " + futureTask.get());
    }
}
